I installed the JBA axle back exhaust on my 05 GT a few weeks ago and they are just not loud enough for me. Anyone here have the Mac Performance axle backs? I work with a guy that just installed the Mac's on his GT and it sounds really, really good. I don't like the JBA's because its not a deep tone, its sort of like a rice burner sound. Anyone here with Mac axle backs tell me what you think of the exhaust. Thanks